The heat source commonly used in the additive-free roasting of Jiuquan City's Stone Coal Vanadium Mine is the clean gas produced by either a Gasifier or a Circulating Fluidized Bed Gasifier. Compared to a gasifier, a circulating fluidized bed gasifier produces no coal tar, tar slag, or phenol-containing wastewater, and it poses less environmental pollution prevention and control pressure and costs. It aligns with the concept of clean production and should be given preference in industries where centralized gas supply is not feasible.